Remake ICDMonitoringTable::Find() not to overwrite all entry fields

If entry is not found its key handle field must not be filled with
last checked entry when using PSA as it will cause key slot to be
cleared by accident.

src/app/icd/server/ICDMonitoringTable.cpp

@@ -242,15 +242,21 @@ CHIP_ERROR ICDMonitoringTable::Get(uint16_t index, ICDMonitoringEntry & entry) c
 
 CHIP_ERROR ICDMonitoringTable::Find(NodeId id, ICDMonitoringEntry & entry)
 {
-    uint16_t index = 0;
-    while (index < this->Limit())
+    CHIP_ERROR         err;
+    uint16_t           index;
+    ICDMonitoringEntry tempEntry(mSymmetricKeystore);
+
+    for (index = 0; index < this->Limit(); index++)
     {
-        ReturnErrorOnFailure(this->Get(index++, entry));
-        if (id == entry.checkInNodeID)
+        SuccessOrExit(err = this->Get(index, tempEntry));
+        if (id == tempEntry.checkInNodeID)
         {
+            entry = tempEntry;
             return CHIP_NO_ERROR;
         }
     }
+
+exit:
     entry.index = index;
     return CHIP_ERROR_NOT_FOUND;
 }